The hacksaw trick works and shouldn't take me more than a month or two. (I'm slow and meticulous, pronounced "lazy"). It will do nicely for a Marine shop in Iwakuni. I was in WERS 17 in 1973-1974...coldest place I've ever been and that is saying a LOT about winter on a peninsula in that climate.
I'm still going to seek out a couple more slightly smaller huts for the 69th Maintenance Battalion HQ that the Army had at Cam Rahn bay in 1969-1969.